Detectives are looking to speak to a man after a woman was approached from behind and attacked in Lambeth.
The victim was walking along Klea Avenue in the early hours of Sunday morning on 27 June. She was pushed from behind into a communal area of flats and seriously sexually assaulted.
The woman managed to scratch the male attacker on his face with her keys before he ran away.
The man is described as Asian, of medium build, 5ft 5ins tall with short black hair, and he spoke with an English accent. Police are appealing for information from anyone who recognises the man from the CCTV.